Electrical Safety Clearance (IE/CEA) (Part-2)

ELECTRICAL SAFETY CLEARANCE-(IE/CEA) (PART-2)

CODE: INDIAN ELECTRICITY RULES/ CENTRAL ELECTRICITY AUTHORITY:

RIGHT OF WAY CLEARANCE (AS PER GETCO STANDARD):

Min ROW

66 KV

18 Meter

132 KV

27 Meter

220 KV

35 Meter

400KV

52 Meter (Single Circuit)

400 KV

48 Meter (Double Circuit)

MINIMUM CLEARANCES BETWEEN ELECTRICAL LINES CROSSING EACH OTHER:

Voltage

66 KV

132 KV

220 KV

400 KV

66 KV

2.4 Meter

3 Meter

4.5 Meter

5.4 Meter

132 KV

3 Meter

4.5 Meter

5.4 Meter

220 KV

4.5 Meter

5.4 Meter

400 KV

4.5 Meter

5.4 Meter

PERMISSIBLE MIN GROUND CLEARANCE OF ELECTRICAL LINE:

Ground Clearance

Over National Highway

66 KV

6.1 Meter

8.0 Meter

132 KV

6.1 Meter

8.6 Meter

220 KV

7.0 Meter

9.8 Meter

400KV

8.8 Meter

10.8 Meter

CLEARANCE FOR TELEPHONE LINE CROSSINGS POWER LINE:

Clearance (Min)

66 KV

2.4 Meter

132 KV

2.7 Meter

220 KV

3.0 Meter

VERTICAL CLEARANCE BETWEEN ELECTRICAL LINE AND RAILWAY TRACKS.

Clearance (Min)

66 KV

14 Meter

132 KV

14.6 Meter

220 KV

15.4 Meter

400 KV

17.9 Meter

CLEARANCE FROM BUILDINGS TO LOW, MEDIUM & HIGH VOLTAGE LINES:

Voltage Description Distance Low & Medium Voltage Flat roof, open balcony, verandah roof ,When the line passes above the building a vertical clearance from the highest point 2.5 Meter Low & Medium Voltage Line passes adjacent to the building a horizontal clearance from the nearest point 1.2 Meter Low & Medium Voltage Line passes above the building a vertical clearance 2.5 Meter Low & Medium Voltage Line passes adjacent the building a Horizontal clearance 1.2 Meter 11 KV to 33 KV Line passes above or adjacent to any building or part of a building 3.7 Meter Above 33 KV Line passes above or adjacent to any building or part of a building 3.7+(0.3 for every additional 33 KV ) Up to 11 KV The horizontal clearance between the nearer conductor and any part of such building 1.2 Meter 11 KV to 33 KV The horizontal clearance between the nearer conductor and any part of such building 2.0 Meter Above 33 KV The horizontal clearance between the nearer conductor and any part ofsuch building 2.0 + (0.3 for every additional 33 KV )

CLEARANCE ABOVE GROUND AT THE LOWEST CONDUCTOR:

Voltage Description Distance Low & Medium Voltage Across a street 5.8 Meter High Voltage Across a street 6.1 Meter Low & Medium Voltage Along a street 5.5 Meter High Voltage Along a street 5.8 Meter Low & Medium Voltage Elsewhere than along or across any street 4.0 Meter High Voltage Elsewhere than along or across any street 5.2 Meter 33 KV & EHV Clearance above ground(Add 0.3 Meter for every 33 KV Volts in 5.2 Meter) Min 6.1 Meter

VERTICAL CLEARANCE AT MIDDLE OF SPAN:

Span

Vertical Clearance (At Middle of Span)

200 Meter

4.0 Meter

300 Meter

5.5 Meter

400 Meter

7.0 Meter

500 Meter

8.5 Meter

SAFETY CLEARANCE FROM LIVE PART IN OUTDOOR SUBSTATION:

Safety Working Clearance

12 KV

2.6 Meter

36 KV

2.8 Meter

72.5 KV

3.1 Meter

145 KV

3.7 Meter

220 KV

4.3 Meter

400KV

6.4 Meter

800 KV

10.3 Meter

LYING OF TELECOMMUNICATION CABLES WITH POWER CABLES (>33 KV).

Cable

Min. Distance

Power cable of voltage exceeding 33 kV shall be laid

Min 1.2 Meter depth

Underground telecommunication cable shall be with underground power cable of voltage exceeding 33 kV.

Min 0.6 Meter Separate from Power Cable

SAFE APPROACH LIMITS FOR PEOPLE:

Voltage

214V to 415 KV

11KV

33KV

66KV

132KV

275KV

Person using manually operated tool 1.3 Meter 2.0 Meter 3.0 Meter 4.0 Meter 5.0 Meter 6.0 Meter Person using power operated tool 3.0 Meter 3.0 Meter 3.0 Meter 4.0 Meter 5.0 Meter 6.0 Meter